Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1998-12-16
2000-09-12
Dougherty, Thomas M.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310319, H01L 41107
Patent
active
061182060
ABSTRACT:
A piezoelectric signal converter comprises a piezoelectric ceramic, four electrodes P.sub.A, P.sub.B, Q.sub.C and Q.sub.D, a load resistance R consisting of N parts R.sub.i (i=1, 2, . . . , N), N-1 terminals T.sub.i {i=1, 2, . . . , (N-1)} between two parts R.sub.i and R.sub.(i+1), and two terminals T.sub.0 and T.sub.N, formed on the electrodes Q.sub.C and Q.sub.D, respectively. The electrodes P.sub.A, P.sub.B, Q.sub.C and Q.sub.D are formed on four side surfaces A, B, C and D, of the piezoelectric ceramic, respectively. The load resistance R is connected between the terminals T.sub.0 and T.sub.N. The piezoelectric ceramic, the electrodes P.sub.A, P.sub.B, Q.sub.C and Q.sub.D, form a piezoelectric vibrator. When a high-frequency electric signal E.sub.IN with a voltage V.sub.IN is applied to the electrodes P.sub.A and P.sub.B, the piezoelectric vibrator is vibrated at a frequency approximately equal to the resonance frequency of the piezoelectric ceramic. An acoustic vibration in the piezoelectric vibrator is transduced to an electric signal E.sub.OUT with a voltage V.sub.OUT and a frequency approximately equal to the resonance frequency. The voltage V.sub.OUT is equal to the sum of N voltages V.sub.i (i=1, 2, . . . , N) corresponding to the parts R.sub.i, respectively. Thus, at least a pair, composed of two of all the terminals T.sub.0, T.sub.i and T.sub.N, delivers an electric signal with a voltage between two terminals which make the pair.
REFERENCES:
patent: 2289954 (1942-07-01), Arndt
patent: 5986384 (1999-11-01), Toda
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